Ambiguous references with the exact same namespace

Question

The RC class is not linked to a database, it is a simple class. The class is at only one place and is not partial. The Aérochem.Domain dll project compiles just

Answer 1

As for the reference of any future users: This thread covers four answers whereas two are in the comments. I have faced the issue several times, three of these answers have helped me in the past, so if you face the same issue, try any of these:

• Clean and/or Rebuild the Solution then reanalyze the files in Resharper.
• Restart Visual Studio then reanalyze
• Delete the bin/ folder then reanalyze
• (Apparently deleting the suo-file can help, too, although I never had to do that and can't understand how it should help)
• A combination of the three above.

(This is not really a new answer, it is more of a comment on the variety of answers and comments found - it is a community wiki so feel free to adapt it if necessary)